/*
 * Copyright 2025 LinQingYing. and contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * The use of this source code is governed by the Apache License 2.0,
 * which allows users to freely use, modify, and distribute the code,
 * provided they adhere to the terms of the license.
 *
 * The software is provided "as-is", and the authors are not responsible for
 * any damages or issues arising from its use.
 *
 */

package org.cangnova.cangjie.serialization.deserialization

import org.cangnova.cangjie.descriptors.EnumDescriptor
import org.cangnova.cangjie.descriptors.packageFragments
import org.cangnova.cangjie.metadata.model.wrapper.EnumWrapper
import org.cangnova.cangjie.name.ClassId
import org.cangnova.cangjie.serialization.deserialization.descriptors.DeserializedEnumDescriptor

class EnumDeserializer(private val components: DeserializationComponents) {


    private val enums: (ClassKey) -> EnumDescriptor? =
        components.storageManager.createMemoizedFunctionWithNullableValues { key -> createEnum(key) }

    // Additional ClassData parameter is needed to avoid calling ClassDataFinder#findClassData()
    // if it is already computed at the call site
    fun deserializeEnum(
        classId: ClassId,
        classData: ClassData? = null
    ): EnumDescriptor? =
        enums(ClassKey(classId, classData))

    private fun createEnum(key: ClassKey): EnumDescriptor? {
        val classId = key.classId
        for (factory in components.fictitiousClassDescriptorFactories) {
            factory.createEnum(classId)?.let { return it }
        }
        if (classId in BLACK_LIST) return null

        val (decl, `package`, metadataVersion, sourceElement) = key.classData
            ?: components.classDataFinder.findClassData(classId)
            ?: return null

        val outerClassId = classId.outerClassId
        val outerContext = if (outerClassId != null) {
            val outerClass = deserializeEnum(outerClassId) as? DeserializedEnumDescriptor ?: return null


            outerClass.c
        } else {
            val fragments = components.packageFragmentProvider.packageFragments(classId.packageFqName)
            val fragment =
                fragments.firstOrNull()
                    ?: return null

            components.createContext(
                fragment, `package`,


                metadataVersion,
                containerSource = null
            )
        }

        return DeserializedEnumDescriptor(outerContext, decl as EnumWrapper, metadataVersion, sourceElement)

    }


}
